const fp = require('lodash/fp')
const { Maybe, Container } = require('./support')

// 练习1
let maybe = Maybe.of([5, 6, 1])
let ex1 = () => {
    return maybe.map(fp.map(fp.add(1)))._value
}
console.log(ex1())

// 练习2
let xs = Container.of(['do', 'ray', 'me', 'fa', 'so', 'la', 'ti', 'do'])
let ex2 = () => {
    return xs.map(fp.first)._value
}
console.log(ex2())

// 练习3
let safeProp = fp.curry(function(x, o) {
    return Maybe.of(o[x])
})
let user = { id:2, name: 'Albert' }
let ex3 = () => {
    const name = safeProp('name')(user)._value
    return fp.flowRight(fp.first, fp.split(''))(name)
}
console.log(ex3())

// 练习4
let ex4 = function(n) {
    let maybe = Maybe.of(n)
    return maybe.map(parseInt)._value
}
console.log(ex4(10.1))